Slovak legal authorities have ruled invalid the calculation of a fee paid by Slovak Telecom (Bratislava, Slovakia) to renew its mobile operating license, according to a story published by Reuters.

The operator, which is 51% owned by Germany’s Deutsche Telekom, had paid €47.8 million ($60 million) last year for the right to offer mobile-phone services in Slovakia for another ten years.

That fee was determined by the Slovak Telecommunications Regulatory Authority, but the Slovak Supreme Court has called into question the method used to calculate it.

As a result, the regulatory body will have to carry out another calculation.

“We will have to make a new ruling on the fee,” said Roman Vavro, a spokesman for the regulator, according to Reuters.

Slovak legal authorities have not said why they saw a problem with the way the license fee was calculated, but France Telecom’s Slovak mobile operation has now complained about the calculation of its own license renewal fee.

France Telecom paid fees of €40.7 million last year.

Vavro has reportedly said that France Telecom’s complaint will be dealt with separately from the Deutsche Telekom issue.